未找到类型为java.util.ArrayList的返回值的转换器(Spring Boot) [英] No converter found for return value of type: class java.util.ArrayList (Spring Boot)

问题描述

我是Spring Boot的新手，正在从事数据库连接方面的工作.所有相关的类都在这里，只有具有run方法的主类没有发布.

I am new to Spring Boot and working on database connectivity. All the related classes are here only main class having run method is not posted.

这给了我ArrayList找不到转换器的错误.

It is giving me the error of no converter found for ArrayList.

如果我做错了任何事情，请帮助我.

Please help me if I am doing anything wrong.

//Customer.java

//Customer.java

package springbootfirstapp.domain;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Customer {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name="id")
private int id;

private String name;
private String phone;

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}
public String getPhone() {
return phone;
}

public void setPhone(String phone) {
    this.phone = phone;
}

public Customer(int id, String name, String phone) {
    super();
    this.id = id;
    this.name = name;
    this.phone = phone;
}

public Customer() {
    super();
}
}

//CustomerController.java

//CustomerController.java

package springbootfirstapp.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import springbootfirstapp.domain.Customer;
import springbootfirstapp.repo.CustomerRepo;

@RestController
@RequestMapping("/customer")
public class CustomerController {

@Autowired
CustomerRepo rp;

@RequestMapping("/findall")
@ResponseBody
public List<Customer> findall()
{
    return rp.findAll();
}
}

//CustomerRepo.java

//CustomerRepo.java

package springbootfirstapp.repo;
import org.springframework.data.jpa.repository.JpaRepository;
import springbootfirstapp.domain.Customer;
public interface CustomerRepo extends JpaRepository<Customer, Integer> {
}

//pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>SpringBootFirstApp</groupId>
<artifactId>springbootfirstapp</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.3.5.RELEASE</version>
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEndoing>UTF-  8</project.reporting.outputEndoing>
    <java.version>1.8</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>

</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>
</project>

堆栈跟踪:

推荐答案

感谢大家的帮助... 通过添加Jackson Mapper依赖项解决了问题

Thankyou everyone for the help... Issue is resolved by adding Jackson Mapper dependency

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.2</version>
</dependency>

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.5.2</version>
</dependency>

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.5.2</version>
</dependency>

<dependency>
<groupId>com.fasterxml.jackson.jaxrs</groupId>
<artifactId>jackson-jaxrs-json-provider</artifactId>
<version>2.5.2</version>
</dependency>

<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-jaxb-annotations</artifactId>
<version>2.5.2</version>
</dependency>

这篇关于未找到类型为java.util.ArrayList的返回值的转换器(Spring Boot)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！